Combined bulldozer and ripper



Oct. 22, 1940. 1.. o. WHlTE COMBINED BULLDOZER AND RIPPER Filed Oct. 31. 1938 LOYD oJAn-l ITQE IMVENTOR.

ATTORNEYS.

ra s 02x22, 1940 UNITED i STATES PATENT oi-"Ficii (Granted under the act or March a, use, as amended All' l to, ma;- im 0.- G. my

This application is made under the act of March 3, 1883, as amended by theact of April 1 patented, may be manufactured-and used byor 5 for the Government of the United States of America for governmental purposes without the payment to me of any royalty thereon.

This invention relates in general to bulldozers and is more particularly concerned with a novel 19 combination of a bulldozer and a ripper.

This invention has for one of its objects the provision of a device which in combination with v any-bulldozer blade, permits ripping, without. in-

terfering with the positive action of the blade, of surfaces normally impenetrable by the bulldozer blade it'self requiring the use of a ripper.

One of the advantages of this invention is that it has a fewer number of parts only one of which is moving. The device is also inexpensiveand 20 can be attached to bulldozer blades already on the market.

The following description considered together with the accompanying drawing will disclosethis invention more fully, its construction and operationof parts, and further objects and advantages thereof will be apparent. i

In the drawing:

' Figure l is a rear elevational view of a linear fragmentary portion of a bulldozer blade showing 0 an embodiment of my invention mounted thereon. i

Figure 2 is a side elevational view of Figure 1.

Figure 3 is an isometric view of Figure 1.

Referring with more particularity to the drawing in which like numerals designate like parts,

a plurality of U-brackets .4, l are secured in horizontal spaced relation'to the rear side of the bulldozer blade 5. To each of these brackets there is .hinged a tooth, or ripping member 6, 40 normally projecting below the bulldozerblade and having an optimum shape for entering the surface to be broken. "I'he entering edge considered as (the back of the tooth is preferably concave while the front of the tooth is convex, intersecting the concaved portion at the top of the tooth, similar to the general shape of a D banana, substantially as shown. However, this invention is not limited to any particular shape of the tooth and other shapes may be employed without departing from the scope of the invention. The shape described is merely illustrative of a satisfactory form. An abutment spacer I may form either a part of the tooth or part of the bulldozer blade and provides a bearing surface for the tooth as well as a means for holding the surface to be broken. 30, 1928, and the invention herein described, if

.ing position-and moved forward by the trac it in a proper relation with respect to- -The operation of this invention is as follows: As the bulldozer blade I is loweredtg a worktor to 1 which it is attached, theteeth 6, 6 partially revolve: about their respective pivots. and float or slide behind the blade without affecting the surface. but by reversing the direction of motion of the blade 5, the teeth 6, 6 revolve about their .10 respective pivots in the opposite direction until they come) in contact with the bulldozer blade Continued moving of the blade forces the teeth into the surface of the groimd. By raising or lowering the bulldozer blade, the desired depth of 15 rippingor loosening of the surface can be accomplished.-

While this device will, work satisfactorily as above-described, constant floating or dragging of the ripper teeth maycause them to wear unnecessarily. Also. it may develop under certain conditions, suchas very tough ground, etc., that it may not be desired to use all of the teeth at tached to the blade. To provide for situations of this nature, hinged'straps .8, or other similar holding means, are disposed on the back of the blade, one above each of therippers. By these means the rippers can be individually held out of contact with the ground for any operation of the bulldozer blade. Figure 2 shows in broken 30 lines one of the rippers being held by its corresponding hinged strap. I Having thus described my invention, I claim: 1. Acombined bulldozer blade and ripper comprising a bulldozer blade and a plurality of individually hinged teeth secured to the back of and projecting below said blade in spaced relation, whereby the bulldozer blade can be used upon movement in one direction and said teeth can be'used independently of said blade upo movement in the opposite direction. 2. In combination with a bulldozer blade aplurality of individually hinged teeth secured on a the backi of and projecting below said blade and aforwardly projecting abutment spacer on each tooth for! holding said teeth in proper operative position against said blade.

- 3. Incombinatlon' with a bulldozer blade a plurality of individually hinged ripping teeth dls- I posed on the back of and projecting below the blade, a forwardly projecting abutment spacer on each tooth for holding said teeth in proper operative position against the blade, straps hinged to said blade one above each of said teeth, each strap being adaptedto loop over its corresponding tooth when said tooth is elevated in a nonoperative position, the point of engagement between the tooth and the strap being below the abutment spacer.

4. An article of manufacture comprising a bulldozer blade, a plurality of individually hinged ripping teeth disposed on the back of and projecting below said blade, a forwardly projecting abutment spacer integral with each tooth for holding said teeth in proper =operative.position against said blade, loop straps hinged to the back or said blade one above each tooth, each strap being adapted to loop over its respective tooth when the tooth is elevated in an on-operative position and to fall below the abutment spacer of the tooth.

LOYD 0. WHITE. 

